DVD occasionally freezes

I'm very very new to this - and I know it's probably a stupid question but I have copied two movies so far and both of them have points where they freeze up a bit. Am I doing something wrong with it? Burning with DVD Decrypter.

its Media (DVD) the ones everybody in here uses is virbitium or ritex!! Personally I use Fujifilm for most movies, BUT THEY WILL NOT play on my daughters DVD player I use Ritex of my daughters movies!! Oh and for all yall sayin I'm wastin my time with cheap DVDS I'm 23 with a fiance, 4 year old daughter, 2 cars (paid off) and getting ready to buy a $150,000 house!! So get off my back I make it work pinching pennies